FLIR T500 series cameras come with an 8 GB SD card, but there is no known or built-in limitation.

All cards have a speed class mark on them that indicates the minimum write speed. A higher-speed card, like an SDHC 10, will do a better job of recording high-data video than an SDHC 4 card.

We recommend that you do not save more than 1000 images on a card, even though a 1 GB card has a capacity of over 1000 images.